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The positive rate of CEA, CA19-9, and CA72-4, and a parallel test of three tumor biomarkers in all patients and in subgroups. M, male; F, female; y, years; Dif, differentiated; Undif, undifferentiated; T, tumor stage; N, lymph node stage; M; M stage; CEA, carcinoembryonic antigen; CA19-9, carbohydrate antigen 19-9; CA72-4, carbohydrate antigen 72-4; PARA, parallel test.
